Isn't your first conclusion only true if every point in the country is close and equi-distant to a port and all ports get the same goods? In practice, you still

Isn't your first conclusion only true if every point in the country is close and equi-distant to a port and all ports get the same goods? In practice, you still truck multiple tonnage. In your example, the port is in LA and say, manufacturing plant in Michigan and I am in Atlanta.. it is still less carbon-emitting to truck from Michigan to Atlanta than ship from Shenzen to LA and then truck from LA to Atlanta..